Don't try to infer top-level namespace in fullindex
Don't try to infer top-level namespace in fullindex

Previously, this template tried to guess the top-level namespace of the
specification being generated by finding the common prefix of all
interfaces. This doesn't work out very well when you have exactly one
interface. :-) But now that interfaces have a sensible short_name
property, we can just use that.

freedesktop-unofficial-mirror/telepathy__telepathy-spec,TelepathyIM/telepathy-spec